The ClientsTable seeder unmarshaled each settings.clients entry into
model.Client and silently `continue`d on error. Older inbounds wrote
tgId as an empty string for every client past the first; that fails to
unmarshal into int64, so only the first client per inbound landed in
the new clients table.
Normalize tgId and the other int64/int fields on the raw map before
marshal+unmarshal: parseable strings convert, empty/unparseable ones
drop so the field falls back to zero. Also log on the residual
unmarshal-failure path so the next regression is visible.
Recover already-seeded installs by re-syncing each inbound's clients
into the relational tables from MigrationRequirements, so running
`x-ui migrate` heals partial seeds.
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